Neutron star–black hole binary systems are an extremely rich and versatile resource for gravitational wave astronomy. The recent detection of two NSBH binaries from their gravitational wave signal by the LIGO–Virgo detector network [1]}, [2]} has provided evidence for their existence in our universe [3]}. However, most of the confidence in the nature of these binaries comes from the measurement of the masses of the lighter companions, which are well within the mass range of known NS [4]}, [5]}, [6]}, [7]}. Conclusive evidence for a companion being a NS through GW observation can only come from the measurement of tidal effects [8]}, [9]}, [10]}, [11]}, [12]}. Unambiguous detection of a population of NSBH systems will have unique and complementary consequences for a wide range of topics such as astrophysics [13]} and cosmology [14]}. It should also be noted that the detection of a BBH system where at least one of the companions has a mass similar to that of a NS (\(\lessapprox 3~M_\odot \) ) will also have strong consequences and a clear hint towards new physics [15]}.
